powerpc/xics: fix refcount leak in icp_opal_init()

JIRA: https://issues.redhat.com/browse/RHEL-80861

CVE: CVE-2022-49432

commit 5dd9e27
Author: Lv Ruyi <lv.ruyi@zte.com.cn>
Date:   Sat Apr 2 01:34:19 2022 +0000

    powerpc/xics: fix refcount leak in icp_opal_init()

    The of_find_compatible_node() function returns a node pointer with
    refcount incremented, use of_node_put() on it when done.

    Reported-by: Zeal Robot <zealci@zte.com.cn>
    Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/20220402013419.2410298-1-lv.ruyi@zte.com.cn

Signed-off-by: Mamatha Inamdar <minamdar@redhat.com>

Author: Mamatha Inamdar

arch/powerpc/sysdev/xics/icp-opal.c

@@ -196,6 +196,7 @@ int icp_opal_init(void)
 
 	printk("XICS: Using OPAL ICP fallbacks\n");
 
+	of_node_put(np);
 	return 0;
 }